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Leases Lease Term, Discount Rate, and Other Lease Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 239 | $ 259
Operating Lease, Weighted Average Remaining Lease Term | 5 years 113 days |
Finance Lease, Weighted Average Remaining Lease Term | 2 years 210 days |
Operating Lease, Weighted Average Discount Rate, Percent | 3.37% |
Finance Lease, Weighted Average Discount Rate, Percent | 3.25% |
Minimum [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee Operating and Finance Leases, Remaining Lease Term | 1 year |
Maximum [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee Operating and Finance Leases, Remaining Lease Term | 50 years |
Residual Value Guarantee [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 46 |

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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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